Last.



PATENTED JAN. 29, 1907.-

G. A. K-RENTLER.

LAST.

APPLICATION FILED AUG.21,1903.

s rn'rns PATENT orrion.

i GEORGE A. KRENTLER, OF DETROIT, MICHIGAN, ASSIGNOR TO KRENTLER- ARNOLD HINGE LAST COMPANY, OF DETROIT, MICHIGAN, A CORPORA- TION OF WEST VIRGINIA.

Patented Jan, 29, 1907;

Application filed August 21, 1903. Serial No. 170369- To (all who/It it 7111, concern:

Be it known that I, GEORGE A. KRENTLER, a citizen of the United States, residing at Detroit, county of \Vayneg State of Michigan, have invented an Improvement in Lasts, of which the following description, in connection with the accompanying drawings, is a specificatioi'i, like letters on the drawings representing like parts.

I\ y invention relates to hinged or divided lasts, andmore particularly to the provision for looking or holding on last against move-- ment into broken position.

The constructional details and operation of my invention will he pointed out in the course of the following description, reference being, had to the accompanying drawings, inwhich Figure l. is a perspective view of a last containing my invention. Figs. 2 and 3 show 'the same in side elevation, the former in lengthened position and the latter in shortened or collapsed position.

My invention is herein shown as applied to a hinged last of the general character shown in the patent to Pym, No. 608,006, July 26, 1898, in which the fore part or section A is joined to the heel part or section B by a: plate-hinge b in a kerf l: and has a rearward extension or knuckle 0 fitting against the front face of the heel part.

A last in use has a strong tendency to move into an intermediate or broken position instead of occupying the proper positions shown in Figs. 2 and 3, and my inven tion relates to means for preventing this movement. Said .ineans consists in. providing an angular projection or wedging-surface 0 on one part of the last, herein shown as on the rear end or secant face of the fore part, and a dwell or cooperating surface on I the other part, herein shown as on the front end or secant face of the heel part, so that when said two cooperating surfaces slide on each other in moving toward said intermediate position they will offer increasing resistance and'will tend to hold the last parts rigidly in lengthened or shortened position. I

As, herein shown, the wedging-surface or protuberance c is secured by providing a bulge or enlargement on the knuckle 0,, slightly eccentric to the pivot-pin], on which plication,

the heel part turns, said heel part being sawed to fit said wedging-snrface 0. Below the latter I extend the knuckle, as indicated at 0 to constitute a stop for limitingthe downward movement of the heel part with relation to the fore part,

The principle upon which the locking de vice'ope'rates is the crowding or wedging of one part past another part when the heel part is turned on its pivot, and l intend to claim the same herein broadly.

In my copending application, Serial No.- 42,5%39, filed January 11, 1901, now Patent N0. 764,894, I have shown and claimed another sp'ecies, consisting of a pin a and spring e, held in a hole 7c and cooperating with the projecting corner (2 of the plate-hinge b.

The operation in both cases is the same, the necessary yielding movement being secured in the species herein claimed by reason of the inherent elasticity of the wood and connections, so that the heel part B is permitted to sw1n upon application of proper pressure with relation to t e fore part and yet normally offers a strong resistanc to movement and holds the parts in a normal position when said wedging-surface c is seated in the dwell or cooperating surface of the heel part.

If thewedging or moving part were made concentric with the pivot-pin f, there would be no point of special resistance; but by lIliLking it eccentric or providing it with a corner or obtuse angularity it cooperates with the opposing resisting-surface to lock the last in operative position.

The most important function of the looking device is to maintain the last in lengthened or working position, and while it is not necessary that the same amount of force be required to straighten th last that is required to collapse it I prefer to form the parts so that it requires considerable force to bend the last in either direction, the last having a natural position of rest or tendency to remain in its two extreme positions, or collapsed and lengthened positions.

In the present case I limit my claims to the species of contacting last-faces having co'operating angular surfaces for securing the desired locking effects, as the invention is broadly (i. e., generically) claimed in my ap-' substantial 1y Serial No. 42,839,.fi1ed January '4 LII 11, 1901, (now Patent No. 76%,894) Where I have shown another species or a dilierent means for ell'ecting the desired results.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is v 1. A divided last, and EL union movably connecting the ports of the last, one of said last parts having a rigid singular or wedging surface, and the other of said last parts having a cooperating rigid resisting-surface, and constructed to maintain the parts at rest when the last is collapsed and to offer increasing resistance in nioi'ing away from collapsed position.

2. A divided lest, having ndjee mt eonteeting secnnt feces, and n union niovnbly connecting the parts, :1 portion of one of said faces consisting of an angular or wedging surface, and a portion of the other of said in-ees consisting of a cooperating resiting-surfnee,

name to this specification in the presence of two subscribing witnesses.

GEO. A. K'HllN'lliER.

Witnesses:

(.on.\ E. LAKE, lloi'isn lumnnn. 

